Add specifications for two-times upscale and unified depth plane features

- Introduced the two-times upscale specification detailing requirements for unified output, fixed model presets, arbitrary dimensions, and consistent job behavior.
- Added scenarios for existing models, repeated upscale, and handling of alpha preservation.
- Created the unified depth plane specification outlining geometry modes, stable interface, and asset evaluation.
- Defined scenarios for mode switching, relief and camera preservation, and validation of delivered assets.

openspec/changes/archive/2026-09-17-show-server-controls-while-running/specs/server-cache-display/spec.md

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+## ADDED Requirements
+
+### Requirement: Cached model list layout
+Server 面板 SHALL 显示所有 Cached 模型名称，并 SHALL 在存在多个模型时让每个模型名称占据独立的视觉行。
+
+#### Scenario: Multiple models are cached
+- **WHEN** Server 为 Running 且 Cached 列表包含两个或更多模型
+- **THEN** 面板逐行显示每个模型名称，并保留缓存清理按钮
+
+#### Scenario: One model is cached
+- **WHEN** Server 为 Running 且 Cached 列表只包含一个模型
+- **THEN** 面板在一行内显示 `Cached` 与该模型名称，并保留缓存清理按钮
+
+#### Scenario: No model is cached
+- **WHEN** Server 为 Running 且 Cached 列表为空
+- **THEN** 面板显示 `Cached: None`，并保留缓存清理按钮

openspec/changes/archive/2026-09-17-show-server-controls-while-running/specs/server-lifecycle-controls/spec.md

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+## ADDED Requirements
+
+### Requirement: Running Server lifecycle controls
+Server 面板 SHALL 在 Server 的每个 Running 子状态下显示重启和停止控制，并 SHALL 保留该子状态对应的状态文本与图标。
+
+#### Scenario: Server is running and waiting
+- **WHEN** Server 状态为 `READY`
+- **THEN** 面板显示 Running 状态、重启按钮和停止按钮
+
+#### Scenario: Server is running and busy
+- **WHEN** Server 状态为 `BUSY`
+- **THEN** 面板显示 Running (Busy) 状态、重启按钮和停止按钮
+
+#### Scenario: Server is not running
+- **WHEN** Server 状态不是 Running 子状态
+- **THEN** 面板不显示 Running 状态的重启和停止按钮，并沿用该状态对应的现有控制或提示